feat(sources): fetch linked URLs for the 252 spreadsheet-only cases

Until now only cases 357+ (plus a few older ones) had their linked URLs
fetched; the other 252 dossiers held just the text pasted into the
spreadsheet, often only the lede. This pass fetches every linked URL for
those cases so the full text is on file before link rot takes it.

- stage_all.py: new --include-sheet-cases flag that lifts the skip on
  cases holding spreadsheet articles. Resumable as before.
- staging/: raw extracts and index.json for the 252 cases.
- sourced-articles.json, case-files-manifest.json: 188 new UNTRIMMED
  blocks. 179 cases gained at least one fetched article; 73 got none
  (49 BLOCKED, 18 THIN, 9 DEAD, 4 video/social, 3 ERROR).
- sources/*.txt: rebuilt with build_cases.py --all. Sheet pastes are
  kept; fetched blocks sit beside them under the NOT YET TRIMMED banner.
  Files previously committed with CRLF are now LF.
- wayback-availability.json: Wayback snapshots exist for 73 of the 98
  failed URL slots; input for an archive-fetch pass.
- README-START-HERE.md: progress note and next step.

verify_all.py PASSES (1836 checks).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GZZENdTLzNGsbNy4DyF1yt

merge-output/staging/085/01_calgaryherald-com.txt

@@ -0,0 +1,39 @@
+Armed men force their way into Calgary home, steal cryptocurrency keys | Calgary Herald
+
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+
+Calgary police are asking the public to help identify a suspect linked to a violent home invasion earlier this week in the southwest community of Canyon Meadows.
+
+Around midnight on April 13, two men armed with handguns forced their way into an apartment in the 11600 block of Elbow Drive S.W., police said.
+
+The men tied up the apartment’s resident and stole computers, jewelry and bank cards from the suite. They also took cryptocurrency keys, which allow holders access to digital financial accounts.
+
+The men forced the victim to disclose his bank PINs, then put him in a storage room and fled.
+
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+The victim, who sustained minor injuries, was able to free himself and call 911, police said.
+
+A man later used one of the victim’s bank cards to withdraw money at an ATM in Crescent Heights, near the intersection of 12th Avenue and Centre Street N.E. The ATM recorded an image of the man, who is unknown to the victim.
+
+Anyone with information on the crime or the suspects is urged to call the police non-emergency line at 403-266-1234. Anonymous tips can also be submitted to Crime Stoppers at 1-800-222-8477 or calgarycrimestoppers.org.
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merge-output/staging/085/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 85,
+    "n": 1,
+    "field": "url",
+    "url": "https://calgaryherald.com/news/crime/police-seek-suspects-in-canyon-meadows-home-invasion",
+    "host": "calgaryherald.com",
+    "fetched_at": "2026-09-05T12:53:51+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 2450,
+    "sha256": "61f25f82de44607e1c952cdfc56b86deb520c7fd5fef59ea18afed97510e24ff",
+    "final_url": null
+  }
+]